// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "base/macros.h"
#include "base/process/process_handle.h"

#include <limits.h>
#include <stddef.h>
#include <sys/sysctl.h>
#include <sys/types.h>
#include <sys/user.h>
#include <unistd.h>

namespace base {

ProcessId GetParentProcessId(ProcessHandle process)
{
    struct kinfo_proc info;
    size_t length;
    int mib[] = { CTL_KERN, KERN_PROC, KERN_PROC_PID, process };

    if (sysctl(mib, arraysize(mib), &info, &length, NULL, 0) < 0)
        return -1;

    return info.ki_ppid;
}

FilePath GetProcessExecutablePath(ProcessHandle process)
{
    char pathname[PATH_MAX];
    size_t length;
    int mib[] = { CTL_KERN, KERN_PROC, KERN_PROC_PATHNAME, process };

    length = sizeof(pathname);

    if (sysctl(mib, arraysize(mib), pathname, &length, NULL, 0) < 0 || length == 0) {
        return FilePath();
    }

    return FilePath(std::string(pathname));
}

} // namespace base
